Main content
![](https://ichef.bbci.co.uk/images/ic/640x360/p0dmsn9l.jpg)
Extreme Tracker Testing
See the extremes our fitness trackers can withstand!
Duration:
This clip is from
More clips from The Secret Genius of Modern Life
-
Lift Braking Power—Series 2, Lift
Duration: 03:08
-
Don’t Look Down: Cable Power—Series 2, Lift
Duration: 01:51
-
Super sneaky speakers—Series 2, Headphones
Duration: 03:17